[Lguest] [PATCH 5/25 -v2] native versions for system.h functions

[Glauber de Oliveira Costa]

This patch adds the native hook for the functions in system.h
They are the read/write_crX, clts and wbinvd. The later, also
gets its call sites patched.

Signed-off-by: Glauber de Oliveira Costa <gcosta at redhat.com>
Signed-off-by: Steven Rostedt <rostedt at goodmis.org>
---
 arch/x86_64/kernel/tce.c    |    2 +-
 arch/x86_64/mm/pageattr.c   |    2 +-
 include/asm-x86_64/system.h |   54 +++++++++++++++++++++++++++++-------------
 3 files changed, 39 insertions(+), 19 deletions(-)

diff --git a/arch/x86_64/kernel/tce.c b/arch/x86_64/kernel/tce.c
index e3f2569..587f0c2 100644
--- a/arch/x86_64/kernel/tce.c
+++ b/arch/x86_64/kernel/tce.c
@@ -42,7 +42,7 @@ static inline void flush_tce(void* tceaddr)
 	if (cpu_has_clflush)
 		asm volatile("clflush (%0)" :: "r" (tceaddr));
 	else
-		asm volatile("wbinvd":::"memory");
+		wbinvd();
 }
 
 void tce_build(struct iommu_table *tbl, unsigned long index,
diff --git a/arch/x86_64/mm/pageattr.c b/arch/x86_64/mm/pageattr.c
index 7e161c6..b497afd 100644
--- a/arch/x86_64/mm/pageattr.c
+++ b/arch/x86_64/mm/pageattr.c
@@ -76,7 +76,7 @@ static void flush_kernel_map(void *arg)
 	/* When clflush is available always use it because it is
 	   much cheaper than WBINVD. */
 	if (!cpu_has_clflush)
-		asm volatile("wbinvd" ::: "memory");
+		wbinvd();
 	else list_for_each_entry(pg, l, lru) {
 		void *adr = page_address(pg);
 		cache_flush_page(adr);
diff --git a/include/asm-x86_64/system.h b/include/asm-x86_64/system.h
index 02175aa..20ed9df 100644
--- a/include/asm-x86_64/system.h
+++ b/include/asm-x86_64/system.h
@@ -68,53 +68,56 @@ extern void load_gs_index(unsigned);
 /*
  * Clear and set 'TS' bit respectively
  */
-#define clts() __asm__ __volatile__ ("clts")
+static inline void native_clts(void)
+{
+	asm volatile ("clts");
+}
 
-static inline unsigned long read_cr0(void)
-{ 
+static inline unsigned long native_read_cr0(void)
+{
 	unsigned long cr0;
 	asm volatile("movq %%cr0,%0" : "=r" (cr0));
 	return cr0;
 }
 
-static inline void write_cr0(unsigned long val) 
-{ 
+static inline void native_write_cr0(unsigned long val)
+{
 	asm volatile("movq %0,%%cr0" :: "r" (val));
 }
 
-static inline unsigned long read_cr2(void)
+static inline unsigned long native_read_cr2(void)
 {
 	unsigned long cr2;
 	asm("movq %%cr2,%0" : "=r" (cr2));
 	return cr2;
 }
 
-static inline void write_cr2(unsigned long val)
+static inline void native_write_cr2(unsigned long val)
 {
 	asm volatile("movq %0,%%cr2" :: "r" (val));
 }
 
-static inline unsigned long read_cr3(void)
-{ 
+static inline unsigned long native_read_cr3(void)
+{
 	unsigned long cr3;
 	asm("movq %%cr3,%0" : "=r" (cr3));
 	return cr3;
 }
 
-static inline void write_cr3(unsigned long val)
+static inline void native_write_cr3(unsigned long val)
 {
 	asm volatile("movq %0,%%cr3" :: "r" (val) : "memory");
 }
 
-static inline unsigned long read_cr4(void)
-{ 
+static inline unsigned long native_read_cr4(void)
+{
 	unsigned long cr4;
 	asm("movq %%cr4,%0" : "=r" (cr4));
 	return cr4;
 }
 
-static inline void write_cr4(unsigned long val)
-{ 
+static inline void native_write_cr4(unsigned long val)
+{
 	asm volatile("movq %0,%%cr4" :: "r" (val) : "memory");
 }
 
@@ -130,10 +133,27 @@ static inline void write_cr8(unsigned long val)
 	asm volatile("movq %0,%%cr8" :: "r" (val) : "memory");
 }
 
-#define stts() write_cr0(8 | read_cr0())
+static inline void native_wbinvd(void)
+{
+	asm volatile ("wbinvd" ::: "memory");
+}
 
-#define wbinvd() \
-	__asm__ __volatile__ ("wbinvd": : :"memory")
+#ifdef CONFIG_PARAVIRT
+#include <asm/paravirt.h>
+#else
+#define clts		native_clts
+#define wbinvd		native_wbinvd
+#define read_cr0 	native_read_cr0
+#define read_cr2 	native_read_cr2
+#define read_cr3 	native_read_cr3
+#define read_cr4 	native_read_cr4
+#define write_cr0	native_write_cr0
+#define write_cr2	native_write_cr2
+#define write_cr3	native_write_cr3
+#define write_cr4	native_write_cr4
+#endif
+
+#define stts() write_cr0(8 | read_cr0())
 
 #endif	/* __KERNEL__ */
 
-- 
1.4.4.2